OPTICAL POSITION DETECTOR AND OPTICAL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an optical position detector and optical device for appropriately acquiring position information with a simple constitution. SOLUTION: This optical position detector includes a light emitting section for emitting light y1to be detected, a reflecting plate 83a that relatively moves along the optical axis direction with respect to the light emitting section and includes an optical pattern where white regions and black regions having a reflectance different from that of the white regions for the light y1to be detected are arranged alternately, and a light receiving section for outputting an output signal based on the light intensity of the light y1to be detected reflected on the reflecting plate 83a. The irradiation width HLof the light y1to be detected emitted by the light emitting section to the reflecting plate 83a is made greater than a pattern width H1formed of the white region and a pattern width H2formed of the black region and made smaller than the pattern width (H1+H2) obtained by adding the pattern width H1formed of the white region to the pattern width H2formed of the black region. Thus, appropriate position detection is allowed. COPYRIGHT: (C)2011,JPO&INPIT